209289452894 has 16 divisors (see below), whose sum is σ = 335235611520. Its totient is φ = 97777051680.

The previous prime is 209289452881. The next prime is 209289452903. The reversal of 209289452894 is 498254982902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58198829 + ... + 58202424.

It is an arithmetic number, because the mean of its divisors is an integer number (20952225720).

Almost surely, 2^209289452894 is an apocalyptic number.

209289452894 is a deficient number, since it is larger than the sum of its proper divisors (125946158626).

209289452894 is a wasteful number, since it uses less digits than its factorization.

209289452894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116401315.

The product of its (nonzero) digits is 29859840, while the sum is 62.

The spelling of 209289452894 in words is "two hundred nine billion, two hundred eighty-nine million, four hundred fifty-two thousand, eight hundred ninety-four".